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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ff999d0eced75fc8a410cee40610119d387f0773d8aa7948f9aeffa3ebaf9c6' 
  AND token = 'Fdqp0o+nw5hi0DHqYcCkDEJdCMTP2OWlW0w44pfYmtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}